#main{
    /*background-color: #8bc34a;*/
    margin: 100px 50px 50px 50px;

}
.error{
    color: red;
}
a{
    color: black;
    text-decoration: none;
}
a:hover{
    color: #666;
}
body{
    margin: 0px;
}
.global-color{
    color: #0abc9c;
}
a[class=button]{
    background-color: beige;
    padding: 2px 10px;
    border: 1px solid gray;
}

/*导航-------------------------------------------------------------------------------------------------------*/
#nav{
    display: flex;
    justify-content: space-between;
    background-color: #0abc9c;
    position: fixed;
    top: 0px;
    left: 0px;
    right: 0px;
}
#nav li{
    display: inline-block;
    margin: 10px 2px;
}
#nav ul{
    padding: 0px;
}
#nav a{
    padding: 10px;
    font-size: 24px;
}
#nav-left{
    margin-left: 20px;
}
#nav-right{
    margin-right: 20px;
}
